摘要
水声信道存在天然的多径衰落特性使得水下声通信变得极其困难,尤其在高阶QAM情况下更为严重.因此针对水声信道提出了一种新的空间分集均衡器来克服由多径衰落引起的码间干扰.该空间分集均衡器中使用的算法由常数模算法和多模算法两部分组成.其中的多模算法部分能够利用高阶QAM信号位于不同的模值上的特点来提高新空间分集均衡器的性能.和基于常数模算法的传统空间分集均衡器相比,新的空间分集均衡器具有低稳态均方误差和快收敛速度.水声信道中的计算机仿真实验验证了新方法的有效性.
Underwater acoustic communication is difficult because the fading multipath channels have high-order QAM signals. A new Spatial Diversity Equalizer（ SDE） is proposed to overcome the inter-symbol interference（ ISI） in underwater acoustic channel. The algorithm in the proposed SDE consists of constant modulus algorithm（ CMA） part and multi-modulus blind equalization algorithm part. The second part of the proposed SDE can use the different modulus nature of the high-order QAM signals to improve the equalization performance. Compared with the traditional SDE based on CMA,the proposed SDE can obtain the lower steady-state mean square error and faster convergence rate. The performance of the proposed SDE is shown in underwater acoustic channels by computer simulations.
出处
《南昌工程学院学报》
CAS
2015年第1期25-29,共5页
Journal of Nanchang Institute of Technology
基金
Supported by Natural Science Foundation of Jiangxi Province(No.2013ZBBE50016)
National College Students’ Innovation and Entreprencurship Training Program(No.201311319029)~~
关键词
空间分集均衡器
水下声信道
常数模算法
Spatial Diversity Equalizer
underwater acoustic channel
constant modulus algorithm
